IMPORTANT: Functions best with 15% gyroid infill. TPU ONLY.
Print four each of the adapters and feet using your choice of TPU. Remove the existing feet from your printer and save the screws. Install the adapters using the factory screws, then insert the cube interface from the printed feet into the adapters.
I had tried several methods to improve the TPU feet I posted earlier, as over time they seemed to harden and reduce function. This design proved to be most effective. I've ran several input shaper calibrations to confirm their benefit. For my Neptune 4 Pro they've been an improvement over my original design and a huge improvement over stock. This should come as no surprise, but after installing these feet I notice very little vibration or shaking in the cabinet the printer sits on, and I can no longer hear the printer operating from the room below.
The author remixed this model.
Enlarged and added interface to mount to printer with an adapter. OrzOrzOrz adaptation used for inspiration.